What does this finding mean?
The policy text has missing or invalid fields.
MTA-STS result code
Invalid MTA-STS policy
mta.policy_invalid
What is the next step?
Correct version, mode, mx and max_age according to RFC 8461.
Please note: The result code describes a technical measurement, not a guarantee of delivery, security or legal compliance.
Content reviewed on 20.08.2026.